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Hubble Space Telescope Hα imaging of star-forming galaxies at z ≃ 1–1.5: evolution in the size and luminosity of giant H ii regions

Livermore, R. C. and Jones, T. and Richard, J. and Bower, R. G. and Ellis, R. S. and Swinbank, A. M. and Rigby, J. R. and Smail, Ian and Arribas, S. and Rodriguez-Zaurin, J. and Colina, L. and Ebeling, H. and Crain, R. A. (2012) Hubble Space Telescope Hα imaging of star-forming galaxies at z ≃ 1–1.5: evolution in the size and luminosity of giant H ii regions. Monthly Notices of the Royal Astronomical Society, 427 (1). pp. 688-702. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20130107-104337394

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Abstract

We present Hubble Space Telescope/Wide Field Camera 3 narrow-band imaging of the Hα emission in a sample of eight gravitationally lensed galaxies at z = 1–1.5. The magnification caused by the foreground clusters enables us to obtain a median source plane spatial resolution of 360 pc, as well as providing magnifications in flux ranging from ∼10× to ∼50×. This enables us to identify resolved star-forming H ii regions at this epoch and therefore study their Hα luminosity distributions for comparisons with equivalent samples at z ∼ 2 and in the local Universe. We find evolution in the both luminosity and surface brightness of H ii regions with redshift. The distribution of clump properties can be quantified with an H ii region luminosity function, which can be fit by a power law with an exponential break at some cut-off, and we find that the cut-off evolves with redshift. We therefore conclude that ‘clumpy’ galaxies are seen at high redshift because of the evolution of the cut-off mass; the galaxies themselves follow similar scaling relations to those at z = 0, but their H ii regions are larger and brighter and thus appear as clumps which dominate the morphology of the galaxy. A simple theoretical argument based on gas collapsing on scales of the Jeans mass in a marginally unstable disc shows that the clumpy morphologies of high-z galaxies are driven by the competing effects of higher gas fractions causing perturbations on larger scales, partially compensated by higher epicyclic frequencies which stabilize the disc.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1365-2966.2012.21900.xDOIArticle
ORCID:
AuthorORCID
Jones, T.0000-0001-5860-3419
Richard, J.0000-0001-5492-1049
Ellis, R. S.0000-0001-7782-7071
Rigby, J. R.0000-0002-7627-6551
Smail, Ian0000-0003-3037-257X
Arribas, S.0000-0001-7997-1640
Colina, L.0000-0002-9090-4227
Additional Information:© 2012 The Authors. Monthly Notices of the Royal Astronomical Society. © 2012 RAS. Accepted 2012 August 8. Received 2012 July 13; in original form 2012 May 23. Article first published online: 2 Nov. 2012. The authors would like to thank Karl Glazebrook, Emily Wisnioski, Lisa Kewley and Norm Murray for useful discussions and Andrew Newman for providing an updated strong lensing model of the cluster Abell 611. RCL acknowledges a studentship from STFC, RGB and IS are supported by STFC and IS further acknowledges a Leverhulme Senior Fellowship. AMS acknowledges an STFC Advanced Fellowship, and JR is supported by the Marie Curie Career Integration Grant 294074. HE gratefully acknowledges financial support from STScI grants GO-09722, GO-10491, GO-10875 and GO-12166. This work is based on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for Program number 12197 and Program number 11678 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.
Funders:
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
Leverhulme TrustUNSPECIFIED
Marie Curie Fellowship294074
NASAGO-09722
NASAGO-10491
NASAGO-10875
NASAGO-12166
NASANAS5-26555
Subject Keywords:gravitational lensing: strong; galaxies: high-redshift; galaxies: star formation
Issue or Number:1
Record Number:CaltechAUTHORS:20130107-104337394
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130107-104337394
Official Citation:Livermore, R. C., Jones, T., Richard, J., Bower, R. G., Ellis, R. S., Swinbank, A. M., Rigby, J. R., Smail, I., Arribas, S., Rodriguez-Zaurin, J., Colina, L., Ebeling, H. and Crain, R. A. (2012), Hubble Space Telescope Hα imaging of star-forming galaxies at z ≃ 1–1.5: evolution in the size and luminosity of giant H ii regions. Monthly Notices of the Royal Astronomical Society, 427: 688–702. doi: 10.1111/j.1365-2966.2012.21900.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36200
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:07 Jan 2013 21:53
Last Modified:09 Mar 2020 13:19

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